Paraffining apparatus for a winding machine



Dec. 19, 1967 R. GFELLER 3,358,641

PARAFFINING APPARATUS FOR A WINDING MACHINE Filed March 7, 1966 2 Sheets-Sheet 1 INVENTOR BY (5M D HM:

Dec. 19, 1967 R. GFELLER 3,358,541

PARAFFINING APPARATUS FOR A WINDING MACHINE Filed March 7, 1966 2 Sheets-Sheet 2 FoLE Kt G' EHEX INVENTOR BYIDMM min United States Patent 3,358,641 PARAFFINING APPARATUS FOR A WINDING MACHINE Robert Gfeller, Horgen, Switzerland, assignor to Maschmenfabrik Schweiter AG., Horgen, Switzerland, a corporation of Switzerland Filed Mar. 7, 1966, Ser. No. 532,400 Claims priority, application Switzerland, Mar. 19, 1965 3,844/ 65 11 Claims. (Cl. 11878) The present invention has reference to an improved parafiining apparatus for use in conjunction with a winding machine, particularly automatic winders.

Devices at winding machines which apply paraffin to the yarn which is to be wound up have already been known to the art for quite some time. In most cases the yarn is passed between an axially displaceable parafiin roll and a plate bearing with its frontal face against such, whereby the paraflin roll which rotates during the winding operation is pressed by means of a spring against the plate and thus deposits paraffin upon the throughpassing yarn.

From the time it was recognized that the traveling properties of the yarn during processing primarily depend upon the uniformity of application of the paraffin, attempts have been made to provide apparatuses which are capable of maintaining, independently of disturbances, conditions which are as constant as possible between the yarn and the rotating parafiin disk. In so doing, a primary consideration is maintaining the press-on or contact pressure between the yarn and the paraflin disk constant, notwithstanding progressive depletion or wear of such paraffin disk or block during the winding operation. I

A known apparatus which has been proposed in order to achieve this objective possesses three forks which are disposed in a line or row, at the base of which the yarn is diametrically guided over the frontal surface of the parafiin roll. The middle fork of these three forks is situated approximately at the axis of rotation of the cylindrical paraffin roll and guides the yarn by a small amount into the hollow chamber of the roll. The relative position v between the free fork ends and the frontal surface of the roll is determined by a number of impact bolts against which the roll with its frontal face is pressed under the action of a spring. Since the yarn slightly encircles the roll, during the winding operation, the tensioned yarn is pressed against the roll and this pressing action is not dependent upon the spring force; it is primarily dependent upon the yarn tension and the encircling or wrapping action of the yarn with regard to the roll. Admittedly, this type apparatus has the advantage that normally existing fluctuations in the yarn diameter do not have any effect upon the amount of applied parafiin since the yarn does not pass over a stationary support. On the other hand, fluctuations of the yarn tension cannot be completely prevented, so that due to their influence there can nonetheless result a change in parafiin application. A further disadvantage of this apparatus is that the automatic introduction of the yarn into the forks after a knotting operation is not always positively ensured, wherefore there are certain reservations against the utilization of such apparatus at automatic winders.

Accordingly, it is a primary object of the present invention to provide an improved parafiining device which effectively overcomes the aforementioned disadvantages.

Another, more specific object of this invention has reference to an improved construction of parafiining device ensuring for the uniform application of paraffin to a yarn during winding of th yarn at a winder.

Still another considerable object of this invention has reference to a parafiining device for use with winding machines which is relatively simple in construction, economical to manufacture, highly reliable in operation, and applies paraflin to a yarn in a very safe, efiicient and uniform manner.

The inventive parafiining device or apparatus equipped with a substantially cylindrical parafiin body or mass floatingly mounted upon a drive shaft and axially displaceable, a counter-surface arranged opposite the free frontal surface of the parafiin mass over which passes, the yarn which is to be waxed, and an adjustment or positioning spring which displaces the parafiin mass against the counter-surface as a function of its depletion, is characterized by the features that there is provided at a holder an impact surface disposed opposite the frontal surface of the parafiin mass and outside the path of travel of the yarn for taking up the press-on force of the positioning spring, and that the counter-surface is formed at a presson body displaceably mounted at the holder for movement parallel to the drive shaft. This press-on body is subjected to the action of a press-on spring in the direction of the frontal surface of the paraflin body.

Since pressing of the yarn against the paraffin body is no longer influenced by the force of the positioning spring as well as the mass of the paraflin body or mass, it is possible to achieve uniform application of paraffin. The presson spring can be appropriately designed in accordance with the desired contact pressure or a pressure range, since it no longer has to fulfil any other functions. Morevoer, the mass of the press-on body can be maintained very small.

Other features, objects and advantages of the invention will become apparent by reference to the following detailed description and drawings in which:

FIGURE 1 is a horizontal sectional view through a paratfining apparatus designed according to a first embodiment of the present invention and illustrating such in its working or operable position;

FIGURE 2 is a fragmentary sectional view, similar to FIGURE 1, yet depicting the components in a different position;

FIGURE 3 schematically illustrates in front view the impact surface and the counter-surface; 7

FIGURE 4 is a perspective view showing a detail of the apparatus of FIGURES 1 to 3;

FIGURE 5 schematically depicts the drive mechanism;

FIGURE 6 is a vertical sectional view of a further detail; and

FIGURE 7 is an axial sectional view of a second'embodiment of inventive apparatus.

Describing now the drawings, it will be understood that only enough of the physical structure of the winding machine itself has been shown in the drawings to enable one skilled in the art to readily understand the underlying principles of the invention. Specifically, by referring to FIGURE 1 it should be recognized that reference character 1 designates a holder or housing which is threadably or otherwise suitably afiixed to the non-illustrated winding station or location. Holder or housing 1 possesses two parallel stepped bores 2 and 3, the respective lengthwise axis of which extends horizontally and transversely with regard to the path of travel of the yarn F. A stepped bolt 4 is arranged for axial displacement in this bore 2 and is urged outwardly (towards the top of FIGURE 1) by ;a suitable spring 5. An impact plate or body member 6 is secured by means of a pin 7 of to the inner end of the bolt 4 depending from the bore 2. The axial displaceability of this bolt 4 is limited on the one hand by the impact body or plate 6, and on the other hand by the head 8 of the bolt 4 which strikes the shoulder or recessed portion 2' of the bore 2.

Considering now the bore 3, it will be seen that there are mounted therein for axial displacement two sleeve members 9 and 10 which are maintained in spaced relationship from one another by a pressure spring 11. Sleeve 9 possesses a stepped portion. 9' to which there is fastened a counter-member or plate 14 by means of a pin 12 and a sleeve 13, and wherein there exists for instance small play between these elements to' ensure for a limited mobility of the counter-plate 14 defining a press-on body. Axial displacement of the sleeve member 9 is limited such that the frontal or counter-surface 14' of the counter-plate or press-on'body 14 can be moved a small amount forwardly or rearwardly with respect to the impact surface 6 of the impact plate or body 6. Sleeve member 10 bears by means of its outer frontal end 10a against a substantially screw-shaped, ascending annular surface or cam track 15 of a rotatable adjustment knob 16 secured by means of a fastening screw 17 to the holder 1.

FIGURE 3 depicts a front'view of the impact plate 6 andthe counteror press-on plate 14 as viewed from the side of the impact surface 6' and counter-surface 14' respectively, wherein the course of movement of the yarn F is depicted by means of the arrow A. It will also be seen that the press-on plate 14 is provided with a substantially semicircular-shaped recess 14" into which projects the impact body or plate 6.

Cooperating with this impact body or plate 6 is a lever system comprising a first lever arm 18 rotatably mounted upon a pin 19 secured to the holder 1 and a second lever arm 20 likewise rotatably mounted upon the pin 19 and operably connected by a tension spring 21 with the first lever arm 18, so that an impact pin 20' carried by the lever arm 20 is'pressed against an impact projection or extension 18' of the lever arm 18. Lever arm 20 is operably connected by means of the actuating rod unit 22 and further, non-illustrated transmission elements mechanically or'electroma'gnetically and/ or electrically with the disturbance-removal servicing unit of the winding machine. This well known servicing or tending unit can, during a disturbance removal operation at a relevant winding station, displace the actuating rodunit 22 in the direction of the arrow B, for instance'by means of a cam disk seated upon a control shaft and upon which also there are seated the cam disks for actuation of the disturbance-removal elements. Owing to this, the levers 18, 20 are rocked in cou'n: terclockwise direction and the impact body or plate 6 is displaced against the action 'or'rhe spring 5. Any excessive displacement or overshooting of the transmissionelements is compensated by the tension spring 21.

A support 24 is pivotally mounted for rocking movement through about 90 at a pivot bolt or shaft 23 secured to the holder or housing 1. In the terminal positions of such support 24 it is held by means of a spring-loaded ball 25 which engages either in the groove '26 or 27 "of the holder 1, as best seen by referring to FIGURE 6. A shaft 28 is freely rotatably mounted by means of ball bearings 29 in the hollow supoprt 2,4 and by knownjstructural elements, securing rings, spacer sleeves and nuts or otherwise fixed in axial direction. In the exemplary embodiment of FIGURES 1 to 6, a drive pulley disk 30 is rigidly connected for rotation with the drive shaft 28. Atthe free end 28' of this shaft 28 there is mounted for lengthwise displace-- ment a sleeve-shaped mandrel 31 and a pressure spring 32 in the bore 31a of the 'mandrel31 braces itself against the front end of the shaft 28. Mandrel 31 is connected for rotation'with the drive shaft 28 by means of a pin 33.

. 7 Since the latter, however, piercingly extends into an elongated 1101634 ofthe mandrel 31, such is axially displaceable upon the shaft 28. The pressure spring32 holds the mandrel 31' in its outer terminal position in which the frontal end 31 thereof is spaced a small distance from the impact surface 6' of'the impact body'or plate 6.

By referring to FIGURE 4 it will be understood and recognized that the mandrel 31 exhibits a quadratic or square external cross-sectional configuration, yet over approximately the entire length two diametrically opposed edges have been flattened to form bevelled surfaces 35. These bevelled surfaces 35 are somewhat shorter than the full length of the mandrel 31 so that at its end there are formed two substantially triangular impact surfaces 36 for the guide plate 37. The hub 37a of this guide plate 37 has a hexagonal-shaped bore in conformity with the outer surface of the mandrel 31 and is lengthwise displaceable upon such. Upon the mandrel 31 and in front of the guide plate 37 there is mounted for lengthwise displacement at substantially cylindrical paraffin body or mass 38 possessing a square bore 38h in conformity with the full cross-section o f the aforesaid mandrel. A pressure spring 39 is arranged between the guide plate 37 and the pulley disk or wheel 39 and which urges the guide plate 37 in a direction towards the impact'plate 6 and the press-on body or plate 14, thereby continually maintaining the paraffin mass 38 in contact with the impact plate 6 (FIGURES l and 2).

In the region of the forward terminal position of the guide plate 37 upon the mandrel 31, which such plate assumes when the parafi'in mass 38 has been consumed or depleted to an unusable remainder, there is secured at the housing or holder 1 an electric switch unit 4!}, the switching shaft 41 of which is provided with an upright lugor feeler 42. This feeler 42 is resiliently held against the surface of the paraflin mass 38 and the outer diameter of the guide plate 37 so that after the latter has moved past towards the inside, it can fall in the direction towards the mandrel 31. To facilitate this falling or dropping action the switching feeler 42 is first of all provided with a protruding finger 42 and further, the switching shaft 41 is located at'a'n acute angle with respect to the mandrel axis.

The drive of the paraflin body or mass 38 via the mandrel 31, the drive shafti28 and the drive pulley 30 takes place via a speed reduction drive .of the grooved drum drive of the winding station (not shown) to a shaft 43 (FIGURE 5) which is rotatably mounted in the holder or housing 1. Shaft 43 has secured thereto a belt pulley or disk 44. A second belt pulley 46 and an arm 47 are freely mounted for rotation at a second parallel shaft 45 secured in the housing '1. The freeend of this arm 47 carries a third' freely rotatably mounted belt pulley 49 at a pin 48 Arm 47 is rocked in clockwise direction about the shaft 45 by a non-illustrated torsion spring so that the driving belt 50 encircling the three belt pulleys 4 4, 46 and 49 is continually tensioned. In the work or effective position of the paraffining apparatus, that is, when the support 24 assumes the full line position of FIGURE 1 and the ball 25 engages in the groove 26 of the housing or holder 1, the drive pulley 30 is disposed within the tangent lying between both belt pulleys 44 and 46, so that it bears against the pulley belt 50 and is partially encircled by the latter. In the alternate position, in other words:

when the ball or sphere engages in the groove 27 and. the support 24 is located in the phantom line positionof FIGURE 1, then the drive pulley 30 is located outside of the aforementionedtangent line in the phantom line: position of FIGURE 5, whereby the drive to the paraffin: body or mass 38 is interrupted. I

The mode of operation of the aforedescribed paraflim ing apparatusis as follows: In FIGURE 1 the normal operating position or the actual working position of the elements is depicted. The pressure spring 39 which possesses' a very flat spring characteristic presses by means of the guide plate 37 the paraflin mass 38 against the impact body or plate 6 so that the latter bears against the shoulder 1' of the housing or holder 1. In so doing 7 the paraffining apparatus is aligned in the thread or yarn path of the winding station such that the path of travel of the yarn F is disposed in the plane of the impact surface 6' of the impact plate 6. Any depletion of the paraffin mass 38 is compensated by the pressure spring 39 since such advances this parafiin mass in the feed diICQ.

tion. The impact body or plate 6 is additionally pressed by the pressure spring against the shoulder 1' so that the position of the impact surface 6' remains unchanged. As a result, the position of the paraffin-depositing frontal surface of the paraffin mass 38 and also the position of the counter-surface 14 of the press-on body or plate 14 hearing against the frontal surface of the paraffin mass, remain unchanged, and between both of which the yarn F which is to be Waxed passes. The contact force of the press-on or counter-plate 14 against the paraffin mass is produced by the press-on or pressure spring 11 and is adjustable in that upon rotation of the adjustment knob 16 the axial position of the sleeve 10 and thus the prestress of the pressure spring 11 is changed by means of its screw-shaped, ascending groove or cam track 15. Due to the unchanged position of the paraffining plane there is brought about that the pressure spring 11 always operates at the same point, that is, the contact force of the press-on plate 14 against the paraffin mass 38 is independent of its length or depletion condition and remains constant and renders it possible to work with very small press-on forces. As a result, there is ensured for a continuous uniform, non-wasteful paraffin application. Analogously, in every operating position and in every operating condition the force of the pressure spring 39 must be larger than that of the pressure spring 11. In the manner already described the parafiin mass 38 is driven in the same direction of travel as the yarn F at a small rotational speed.

As is known to those versed in the art, if the yarn ruptures, the relevant winding station is automatically stopped at automatic winders and brought into operable association with a disturbance-removal servicing unit which, in known manner, actuates the necessary disturbance-removal elements by means of cams seated upon a control shaft. Simultaneous with the disturbance-removal operation, that is, seeking of both yarn ends and knotting them together, a cam disk seated upon the aforementioned control shaft actuates the parafiining apparatus. When this happens the actuating rod 22 is moved by non-illustrated transmission elements towards the right in the direction of the arrow B, whereby the lever 20 and, by means of the tension spring 21, also the lever 18 are rocked in counterclockwise direction. Consequently, the lever 18 presses by means of its nose 18" against the impact plate 6 and displaces such against the force of the spring 5 and together with the parafiin mass 38 back against the force of the spring 39 until the head 8 of the bolt 4 bears against the shoulder 2' in the holder or housing 1. Together with the rearward displacement of the paraffin mass 38, the mandrel 31 is also rearwardly displaced against the force of the spring 32 when the impact plate 6 contacts the frontal face 31 of this mandrel 31. In so doing, the counteror press-on plate 14, due to the action of the force of the spring 11, follows to such an extent until the stepped sleeve 9 is seated upon the shoulder 3' of the holder 1. As seen in FIGURE 2 a gap or space 51 appears between the press-on plate 14 and the paraffin mass 38 which is sufficient to enable deposition of the newly knotted yarn F between this press-on plate 14 and the paraffin mass 38, whereafter the actuating rod 22 and the transmission elements are released by the cam disk and all components are returned by the force of the springs 5, 32 and 39 into the original position, i.e. operating state.

In order to prevent further winding without application of paraflin at such time as the paraffin mass 38 is depleted, there is provided the electric switch unit 40. Thus, as soon as the parafiin mass has been used up so that there only remains a non-usable portion and the guide plate 37 is located directly in front of the impact surfaces 36 of the mandrel 31, then the feeler 42 drops behind the guide plate 37 in the direction towards its center, whereby the electric switch unit 40 is actuated. Since the guide plate 37 does not rotate completely true and its axial forward movement is extremely small due to the very slight par- 6 aflin depletion, the danger exists that the feeler 42' will become clamped with the guide plate 37. This circumstance is effectively overcome in that, first of all, the axis of the switching shaft 41 is at an acute angle with respect to the mandrel 31, so that the feeler 42, after moving past the outermost edge 37' of the guide plate 37, is spaced from its frontal side and, additionally, the feeler 42 is provided with a protruding switching finger 42.

All automatic winders are provided, as is known, with an apparatus which brings to standstill each of the winding locations independently of the remaining winding stations or locations or the servicing unit for removing the disturbance or faulty yarn condition as soon as the relevant windup bobbin has attained the predetermined diameter. This shutdown apparatus is also acted upon by the parafiining apparatus which, upon depletion of the paraflin mass 38 down to the critical extent, brings about its actuation via the electric switch unit 40. Application of a new parafiin mass 38 is undertaken in the manner that the mandrel 31 together With the support 24 is pivoted outwardly through about the pivot shaft 23 into the phanom line position of FIGURE 1, the new parafiin mass 38 is slipped onto the mandrel 31 and both are again rocked back into the working position. In so doing, the drive pulley 30 is also brought into driving relationship with the driving belt 50 (FIGURES 1 and 5) and the electric svw'tch unit 40 is placed into the starting position in that the new parafiin mass 38 impacts against the extension 42" of the feeler 42 and erects such.

In the variant embodiment of FIGURE 7, wherein like reference characters have been generally used for the same or analogous elements, there is merely depicted a modified drive for the paraffin mass in comparison with that of FIGURES 1 to 6, and specifically, wherein the paraffin mass is suddenly brought to standstill in the event of yarn rupture at the relevant Winding station whereas its drive elements, due to their larger mass and their driving action which comes from the grooved drum, merely slow down. In this embodiment, unless otherwise indicated, the components correspond to those of FIG- URES 1 to 6.

In this case, the drive pulley disk 30' is freely rotatable upon the shaft member 28. A sleeve member 51 mounted upon the shaft 28 is rigidly connected therewith by a pin 52, the length of which is larger than the diameter of the aforesaid sleeve member 51. The protruding ends of this pin 52 engage with the grooved wedges or keyways 53 of a slidable sleeve member 54 arranged upon the sleeve member 51. The slidable sleeve member 54 is provided at its external surface with an annular groove 55 and at its frontal face with entrainment pins 56 which can be pushed into appropriate bores 57 of the pulley disk 30 and serve as entrainment means for the latter. An electromagnet 58 is fastened to the support 24 and its armature 58a is connected through the agency of a rod 60 with a switching fork 61 engaging with the annular groove 55. A pressure spring 62 disposed between the switching fork 61 and the frontal face of the support 24 strives to press this switching fork 61 and thereby the slidable sleeve 54 together with the entrainment pins 56 into engagement with the drive pulley disk 3%). In excited state of the electromagnet 58, as depicted, it acts to pull the entrainment pins 56, against the action of the spring 62, out of engagement with the drive pulley disk 30'. The electromagnet 58 is located in a current circuit, generally indicated by reference character 59, of a nonillustrated switch which in known manner can be actuated by the yarn feeler associated with the relevant win-ding station and upon occurrence of yarn rupture it is immediately closed.

In the usual manner, this yarn feeler will respond if yarn rupture occurs at the relevant associated winding station and in the conventional manner brings to standstill the drive for this winding station. On the other hand, it actuates the associated aforesaid electric switch whereby 7 the current circuit 59 for the electromagnet 58 is closed. The thus excited electromagnet'58 pulls its armature 53a downwardly, as depicted in FIGURE 7, whereby the switching fork 61 is also pulled downwardly against the action of the spring 62, as is also the slidable sleeve 54. Owing to this, the entrainment pins 56 are also pulled out of engagement with the drive pulley disk 39' and hence, the driving connection between the drive shaft 23 and the pulley disk 30' via the pin 52, slidable sleeve 54 and entrainment pins 56, is interrupted. The pulley disk 3t) freely rotates upon the shaft member 28 during the running-out or slowing-down of the bobbin and grooved drum due to its mass, whereas the shaft 28 is suddenly brought to a stop, specifically because of its smaller mass and also on account of the frictional action of the paraffin mass 33 against the stationary counteror press-on plate 14. Accordingly, a winding-up of the loose tensionless yarn end upon the paraffin mass is effectively prevented. If the yarn rupture is subsequently remedied and the yarn feeler or supervisor of the relevant winding .stationreturned into its operating position, then the electric switch in the current circuit 59 is also opened so that the electromagnet 58 is without current and the spring 63 upwardly displaces the switching fork 61 and the slidable sleeve 54 together with the entrainment pins 56, with the latter again brought into engagement with the pulley disk 30 so that the driving connection between the drive shaft 28 and the pulley disk 30' again appears and the parafiin mass 38 is driven.

While there is shown and described present preferred embodiments of the invention it is to be distinctly understood that the invention is not limited thereto but may be otherwise variously embodied and practised within the scope of the following claims.

What is claimed is:

1. Parafiining apparatus for a winding machine comprising, in combination, a drive shaft, a parafliu mass floatingly mounted for axial displacement upon said drive shaft, said paraffin mass having a free frontal surface for contact with a yarn to which paraffin is to be applied, a counter-surface confronting said free frontal surface of said paraffin mass and over which the yarn passes, positioning spring means cooperating with said parafiin mass for displacing the latter against said counter-surface in accordance with the depletion of the paraffin mass, 21

holder, an impact surface provided at said holder confronting said free frontal surface of said parafiin mass and located externally of the path of travel of the yarn, a press-on body displaceably mounted at said holder for movement substantially parallel to said drive shaft, said press-n body providing said counter-surface, and a presson spring for urging said press-on body in a direction towards said free frontal surface of said paraifin mass.

2. 'Parafiining apparatus according to claim 1, wherein said counter-surface is substantially circular-shaped and possesses a recess, an impact body carrying said impact surface located in said recess.

3. Parafifining apparatus according to claim 1, further including an axially displaceable sleeve mountedat said holder, said press-on spring comprising a pressure spring having one end removed from said press-on body bearing against said axially displaceable sleeve.

4. Paraflining apparatus according to claim 3, further including a rotatable knob mounted at said holder, said rotatable knob being provided with a substantially screwline-shaped cam track at the side confronting said axially displaceable sleeve, said-axially displaceable sleeve having a free end bearing against said cam track.

5. Paraffining apparatus according to claim 1, further including a return spring cooperating with said impact surface, said impact surface being displaceable towards said parafiin mass against the action of saidreturn spring.

6. Paraffining apparatus according to claim 5, further including lever means cooperating with said impact surface, and an actuating rod with which said lever means is including a driving pulley belt, said pulley disk being located in the path ofmovement of said driving pulley belt when said support is located in said work position.

9. Parafiining apparatus according to claim 8,-wherein said pulley disk is fixedly mounted for rotation with said drive shaft.

10. Parafiining apparatus according to claim 8, wherein said pulley disk is freely rotatable upon said drive shaft, 7

and means for selectively coupling said pulley disk in rigid driving connection with said drive shaft. 7

11. Parafiining apparatus according to claim 1, further including a feeler cooperating with said parafiin mass, and electric switch means coupled with said feeler.

References Cited UNITED STATES PATENTS 3/1941 Lytton 1l878 8/1961 Steele 11878 CHARLES A. WILLMUTl-I, Primary Examiner. R. 1. SMITH, Assistant Examiners. 

1. PARAFFINING APPARATUS FOR A WINDING MACHINE COMPRISING, IN COMBINATION, A DRIVE SHAFT, A PARAFFIN MASS FLOATINGLY MOUNTED FOR AXIAL DISPLACEMENT UPON SAID DRIVE SHAFT, SAID PARAFFIN MASS HAVING A FREE FRONTAL SURFACE FOR CONTACT WITH A YARN TO WHICH PARAFFIN IS TO BE APPLIED, A COUNTER-SURFACE CONFRONTING SAID FREE FRONTAL SURFACE OF SAID PARAFFIN MASS AND OVER WHICH THE YARN PASSES, POSITIONING SPRING MEANS COOPERATING WITH SAID PARAFFIN MASS FOR DISPLACING THE LATTER AGAINST SAID COUNTER-SURFACE IN ACCORDANCE WITH THE DEPLETION OF THE PARAFFIN MASS, A HOLDER, AN IMPACT FRONTAL SURFACE PROVIDED AT SAID HOLDER CONFRONTING SAID FREE FRONTAL SURFACE OF SAID PARAFFIN MASS AND LOCATED EXTERNALLY OF THE PATH OF TRAVEL OF THE YARN, A PRESS-ON BODY DISPLACEABLY MOUNTED AT SAID HOLDER FOR MOVEMENT SUBSTANTIALLY PARALLEL TO SAID DRIVE SHAFT, SAID PRESS-ON BODY PROVIDING SAID COUNTER-SURFACE, AND A PRESSON SPRING FOR URGING SAID PRESS-ON BODY IN A DIRECTION TOWARDS SAID FREE FRONTAL SURFACE OF SAID PARAFFIN MASS. 